Method of handling flue dust



Oct. 13, 1925- G. w. VREELANQ METHOD OF HANDLING FLUE DUST Fned'bct, 13,1921 s Sheets-Sheet 1 G. W. ,VREELAND METHOD OF HANDLING FLUE DUST FiledOct. 13, 1921 3 Sheets-Sheet 2 Oct. 13, 1925. 1,557,123

3. w. VREELAND METHOD OF HANDLING mus DUST Filed Oct. 15, 192 sSheets-Sheet 3 Patented Oct. 13, 1925.

GEORGE w. vnEELann, or s'rnunnnvrnan; onto.

METHD E EANDLING FL'UE DUST.

Application filed fictober 13, 1921. Serial No. 507,41tl.

T 0 all whom it may concern:

Be it known that I, Gnonon W. -VREELAND, a citizen of the United States,and resident of Steubenville, in the county of Jefferson and State ofOhio, have invented certain new and useful Improvements in Methods ofHandling Flue Dust, of which the folv lowing is a specification.

My invention relates hot blast furnace flue dust, and while not limitedthereto relates more particularly to the handling of hot flue dust as itis discharged from dry gas cleaners and dust catchers.

One object of this invention is to provide a novel method of handlingthe hot line dust so that it will be'cooled before it is discharged intothe atmosphere.

Another object of the invention is to provide an improved method wherebythe flue dust will be dampened sufiiciently to prevent it blowing aroundwhen discharged into the atmos here.

in the pug. mill --ingsformmg -ure1isa for carrying out my im e the -hotflue dust manner.

.tol$rmit manual handling- Hereto ore the hot flue ,dust vhas beendischarged from the gas cleaners "and dust catchers into cars or otherreceptacles, and, due to its finely divided or pulverizedform itholdsits heat for days. In some instances it is so hot that it will damagethe car into which it is dumped. Also, due to its pulverized form it isreadily scattered by slight winds andthereby forms a menace to workmenin and around the mill. The present invention eliminates the abovedisadvantages and provides for the handling of in la highly improvedBroadly, myimproved method consists in discharging the flue dust from adry gas cleaner or dust catcher directly into a closed conveyor casing,

dust and water so as to dampen and cool the dust," thereby facilitatingthe handling of the dust. in cars or other receptacles, since it issufliciently dampened to prevent scattering bythe wind and sufficientlycool thereof.

ferring now particularly to the drawroved method appliedto the lower endo Figure lfiis a somewhat diagrammatic 7 side elevation of a dry gascleaner, the lower I to the handling of cates with.

conveying the dust I mill casing 16.

to a pug mill, spraying water on the dust' d intimately mixing" the.

part .of-this specification, Figfront elevation of the apparatus a-drygas cleaner end of which is shown on a larger scale in Figure 1.

The cleaner 1 is bers within the cleaner. A gas inlet main 1 and a gasoutlet main 1 extend upwardly along the opposite sides of the cleaner tocarry the unclean gases to'the cleaner and the cleaned gases away fromthe cleaner. The lower end 2 of the cleaner 1 and the lower ends of thepipes or conduits 3 are connected with suitable inlets 4 and 5,respectively,

bells 7 and 8 are provided in the lower end in a conveyor casing 6.Suitable of the cleaner-casing 2 and pipes 3, re-

spectively, each of which has .a counterweighted control lever 9 so thatthey will only open to discharge the dust-into the conveyor casing aftera predetermined amount has collected or built up above the bells, orsaid bells may be operated manually at any desired time.

Right and left hand screw conveyer flights 1 10 and 11 are mounted on asingle conveyer shaft 12 'ou rnaled in bearings 13 and 14. The conveyorcasing is provided with a central outlet 15, served by both sets of theconveyer flights 10 and 11, and commun1-.

an inlet in one end of a pug The pug mill casing 16 is provided with anoutlet spout, 17 at its opposite end is discharged into.

through which the dust a car 18 or other receptacle.

Apair of shafts 19 and 20 extend longitudinally within the pug mill"casing 16' and are journaled in suitable bearings 21 and 22, res v V Aplurality of blades or paddles 23 are ctively.

secured on each of the shafts 19 and 20 for thoroughly mixin the fluedust. The blades 'or paddles 23 are angularly dlsposed or twisted so asto move the fiu e dust lengthwise of. the casing 16 as t 15 mixed and,

' paratus force it to discharge through the discharge spout 17.

A pair of spray pipes 24 and 25 are arranged to enter the pug millcasing 16 adjacent its inlet end so as to spray water upon the dust asit enters the mill.

The conveyer shaft 12 and paddle shafts 19 and 20 are all driven from asingle motor 26. The motor 26 is provided with a sprocket 27 which isconnected to a sprocket 28 on the shaft 20 by a drive chain 29. A secondsprocket 30 is mounted on the shaft 20 and is connected by a drive chain31 to a sprocket 31 on a shaft 32 journaled in bearings 33 on a bracketextending from the conveyer casing 6. The shaft 32 is provided with abevel gear 34 in mesh with a second bevel gear 35 on the end of theconveyer shaft 12 and gears 36 and 37 are mounted on the paddle shafts19 and 20, respectively, and are in mesh with each other, so that theconveyer shaft 12 and paddle shafts 19 and 20 are driven simultaneously,and the paddle shafts are rotated in opposite directions to each other.

The operation of the above described apin carrying out my improvedmethod is as follows:

The hot blast furnace gases which are laden with flue dust and otherforeign matter pass from the main 1 into the dry gasclean r 1 where thedust and other foreign mater is removed and the cleaned gases pass outof the cleaner into the main 1. The flue dust and pieces of coke, limestone or other foreign matter flow from the cleaner into the conduits orpipes 3 and some also collects in the hopper-like bottom 2 of thecleaner 1. When the flue dust collected in the hopper-like bottom 2 andconduits or pipes 3 becomes suflicient to overcome the counterweightedbells 7 and 8, the bells will open and the collected dust will flow intothe conveyer casing '6 and be moved or conveyed toward the centraloutlet port 15 by the screw conveyer flights 10 and 11 and forced tofall through the port 15 into the pug mill casing 16. As the flue dustenters the pug mill casing 16 it is sprayed with water from the spraypipes 24 and 25 and then thoroughly mixed by the blades or paddles 23 onthe shafts 19 and 20 within the pug mill casing, thereb being thoroughlymoistened and coole The' flue dust is conveyed along the' pug millcasing and forced to fall through the discharge spout 17 into a car orother receptacle 18 by the blades 23 due to their novel sha e. v

It will readily seen that after the finely set my hand.

divided flue dust is thoroughly moistened and cooled it may be readilyhandled and conveyed from place to place since the particles will adheresufliciently to each other to prevent it being blown around or scattered by the wind.

It will be understood that the words gas cleaner as used in the claimsmay include any mechanism for the separation of flue dust and the likefrom hot blast furnace gases by dry cleaning, whether by the well knowngravity separation methods, filtering, or an other dry method.

I c aim 1. The method of handling hot blast fur nace flue dust, whichconsists in separating the flue dust from the hot blast furnace gases ina suitable dry gas cleaner, then passing the separated flue dust througha closed receptacle, adding water to said flue dust in the receptacle,and agitating the flue dust within the rece tacle to intimately mix thewater with the libs dust.

2. The method of handling hot blast furnace flue dust, which consists inseparating the flue dust from the hot blast furnace gases in a suitabledry gas cleaner, then passing ,the pug m1ll, adding water to the fluedust within the pug mill and agitating the mixture therein to dampen andcool the dust.

3. The method of handling hot blast furnace flue dust, which consists inseparating the flue dust from the hot blast furnace gases in a suitabledry gas cleaner, then conveying the separated flue dust to a pug mill,adding water to the flue dust within the separated flue dust through apug mill, intimately mixing the flue dust and water to dampen and coolthe dust while conveying the mixture through the pug mill anddischarging the flue dust into a suitable receptacle. 1 o

4. The method of handling hot blast furnace flue'dust, which consists inseparating the flue dust from the hot blast furnace gases in a suitabled gas cleaner, then conveying the separate hot flue dust from the gascleaner through air anddust-proof conveyors to an air and dust-proof pugmill, adding water to the hot flue dust in the pug mi-ll, intimatelymixing the flue dust and water to thereby dampen and cool the flue dustin the passage thereof through the pug mill, and discharging thedampened and cooled flue dust into a. suitable. receptacle.

In testimony whereof I have hereunto

